The ruling, handed down by Fulton County Superior Court Judge Thomas Cox, applies to a hand-count rule for Election Day ballots and rules tied to the certification of results.
Cox wrote that the five-member board, which includes three officials lauded by former President Donald Trump, "had no authority to implement these rules," and that the measures were “illegal, unconstitutional, and void.”
The Georgia Secretary of State's Office and the state election board did not immediately respond to requests for comment Wednesday night.
